Image adjuster and image adjusting method and program

Abstract

An image adjuster includes an area evaluator to calculate an area evaluation value for each color in each of divided areas of each of images captured by a plurality of imaging units, a brightness adjuster to calculate a brightness adjustment value for overlapping divided areas between photographic areas of the images on the basis of the area evaluation value for each color, and an adjustment value calculator to calculate a balance adjustment value for each of the overlapping divided areas from the area evaluation value for each color on the basis of the brightness adjustment value.

What is claimed is: 
     
         1 . An image adjuster which provides an adjustment condition to an image, comprising:
 an area evaluator to calculate an area evaluation value for each color in each of divided areas of each of images captured by a plurality of imaging units;   a brightness adjuster to calculate a brightness adjustment value for overlapping divided areas between photographic areas of the images on the basis of the area evaluation value for each color; and   an adjustment value calculator to calculate a balance adjustment value for each of the overlapping divided areas from the area evaluation value for each color on the basis of the brightness adjustment value.   
     
     
         2 . The image adjuster according to  claim 1 , further comprising:
 an adjustment value determiner to determine a smoothed balance adjustment value for each of the divided areas by applying weighted averaging to the balance adjustment value in a periphery of each divided area.   
     
     
         3 . The image adjuster according to  claim 1 , wherein
 the brightness adjuster comprises   a first calculator to calculate an area brightness value for each of the overlapping divided areas on the basis of the area evaluation value for each color, and   a second calculator to calculate a gain value for each of the captured images as the brightness adjustment value according to a difference in largest area brightness values of the overlapping divided areas of the captured images.   
     
     
         4 . The image adjuster according to  claim 1 , wherein
 the adjustment value calculator adjusts the area evaluation value for each color according to the brightness adjustment value to obtain the balance adjustment value.   
     
     
         5 . The image adjuster according to  claim 1 , wherein
 the brightness adjuster comprises a third calculator to calculate a corrected offset value for each of the captured images as the brightness adjustment value according to a difference in smallest area brightness values between the overlapping divided areas of the captured images.   
     
     
         6 . The image adjuster according to  claim 2 , wherein
 the adjustment value determiner comprises a determiner to determine a weight of the weighted averaging for the overlapping divided areas and non-overlapping divided areas according to a difference in the balance adjustment values between the overlapping divided areas and non-overlapping divided areas.   
     
     
         7 . The image adjuster according to  claim 1 , wherein:
 the captured images are captured by different imaging units;   the balance adjustment value is a white balance adjustment value for each of the imaging units and for each of the divided areas of the images from the imaging units.   
     
     
         8 . The image adjuster according to  claim 1 , further comprising
 a gain setter provided preceding the area evaluator, to apply an adjustment gain to each of the captured images, the adjustment gain for absorbing a difference between sensitivities of individual solid-state image sensors of the imaging units.   
     
     
         9 . An image adjusting method for providing an adjustment condition to an image, causing a computer to execute the steps of:
 calculating an area evaluation value for each color in each of divided areas of each of images captured by a plurality of imaging units;   calculating a brightness adjustment value for overlapping divided areas between photographic areas of the images on the basis of the area evaluation value for each color; and   calculating a balance adjustment value for each of the overlapping divided areas from the area evaluation value for each color on the basis of the brightness adjustment value.   
     
     
         10 . A non-transitory computer-readable storage medium storing a program for causing a computer to execute the steps of:
 calculating an area evaluation value for each color in each of divided areas of each of images captured by a plurality of imaging units;   calculating a brightness adjustment value for overlapping divided areas between photographic areas of the images on the basis of the area evaluation value for each color; and   calculating a balance adjustment value for each of the overlapping divided areas from the area evaluation value for each color on the basis of the brightness adjustment value.